enter intro cutscene

Common/Util/Security/Crypto.cs

@@ -0,0 +1,29 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace MikuSB.Util.Security;
+
+public class Crypto
+{
+    private static readonly Random SecureRandom = new();
+
+    // Simple way to create a unique session key
+    public static string CreateSessionKey(string accountUid)
+    {
+        var random = new byte[64];
+        SecureRandom.NextBytes(random);
+
+        var temp = accountUid + "." + DateTime.Now.Ticks + "." + SecureRandom;
+
+        try
+        {
+            var bytes = SHA512.HashData(Encoding.UTF8.GetBytes(temp));
+            return Convert.ToBase64String(bytes);
+        }
+        catch
+        {
+            var bytes = SHA512.HashData(Encoding.UTF8.GetBytes(temp));
+            return Convert.ToBase64String(bytes);
+        }
+    }
+}